Not much more than the title to say but I'll elaborate for the hell of it you see, in the Lore I can't really find non-altmer in that order, let's take a look at the other members, we got Celarus, Quaranir, Gelebros, Tandil and Nerien all of who are altmer.
The topic articel states Divayth Fyr and Sotha Sil as members of the order, both of who were Dunmer, or former Chimer. But it doesn't seem they were official members of the Order only taught magic to some for a time.
So what are your thoughts? Is the order Altmer exclusive or was it open to Chimer as well? Would a Breton or Nord be allowed to join them should they be Knowledgeable enough of their ways?